September weather forecast
Seward, AK

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The busy Small Boat Harbor in Seward City, Alaska
The busy Small Boat Harbor in Seward City, Alaska

Weather in September

September marks the beginning of fall in Seward with the arrival of some striking changes in weather characteristics. Temperatures start descending with average highs plummeting to 48.7°F (9.3°C). However, rainfall reaches an annual high at 5.75" (146mm), paving the way for lush landscapes and a flourishing local ecosystem. It is worth noting that sea temperatures minimally decline to 53.4°F (11.9°C), still suitable for various marine activities. September thus oscillates between the last remnants of summer and the early beginnings of autumn, providing a unique weather blend.

Temperature

The beginning of September brings a minor change in the average high-temperature, shifting from a refreshing 55.6°F (13.1°C) in August to a chilly 48.7°F (9.3°C). Seward's September nights observe a minor shift from the daytime temperatures, resulting in an average dip to an icy 41.9°F (5.5°C).

Humidity

In Seward, the average relative humidity in September is 82%.

Rainfall

In September, the rain falls for 17.6 days. Throughout September, 5.75" (146mm) of precipitation is accumulated. In Seward, during the entire year, the rain falls for 166.9 days and collects up to 56.06" (1424mm) of precipitation.

Snowfall

June through September are months without snowfall in Seward.

Ocean temperature

In Seward, in September, the average water temperature is 53.4°F (11.9°C).
Note: While a brief time in 53.4°F (11.9°C) at 55.4°F (13°C) is already bracing, plunging below 50°F (10°C) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

In Seward, Alaska, the average length of the day in September is 12h and 49min.
On the first day of the month, sunrise is at 6:54 am and sunset at 8:59 pm. On the last day of September, in Seward, Alaska, sunrise is at 8:03 am and sunset at 7:31 pm AKDT.

Sunshine

In September, the average sunshine in Seward is 6.2h.

UV index

In Seward, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index, 2 during September, leads to the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
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Frequently asked questions

What is the average September temperature in Seward?

An average high-temperature, in September, in Seward, is 48.7°F (9.3°C) and the average low-temperature is 41.9°F (5.5°C).

What is the average humidity in September in Seward?

The average relative humidity in September in Seward, Alaska, is 82%.

How many days does it rain in September in Seward?

In Seward, Alaska, during September, the rain falls for 17.6 days and regularly aggregates up to 5.75" (146mm) of precipitation.

When it does not snow in Seward?

In Seward, Alaska, snow does not fall in June through September.

Does it snow in Seward in September?

In Seward, in September, it doesn't snow. In October, it regularly snows.

What is the ocean temperature in September in Seward?

In Seward, the average seawater temperature in September is 53.4°F (11.9°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does Seward have in September?

In Seward, the average day length in September is 12h and 49min.

What time are sunrise and sunset in September in Seward?

In September, on the first day of the month, sunrise is at 6:54 am and sunset at 8:59 pm. On the last day of the month, in Seward, Alaska, sunrise is at 8:03 am and sunset at 7:31 pm AKDT.

How long on average sun shines in September in Seward?

The average sunshine duration in September in Seward, Alaska, is 6.2h.

How high is the UV index in September in Seward?

In Seward, Alaska, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Seward, AK

Average temperature in September - Seward, AK
  • Average high temperature in September: 48.7°F

The warmest month (with the highest average high temperature) is July (56.8°F).
The month with the lowest average high temperature is January (24.6°F).

  • Average low temperature in September: 41.9°F

The month with the highest average low temperature is July (47.8°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in September
Seward, AK

Average pressure in September - Seward, AK
  • Average pressure in September: 29.73"Hg

The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is November (29.61"Hg).

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Average wind speed in September
Seward, AK

Average wind speed in September - Seward, AK
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is November (8.9mph).
The calmest month (with the lowest average wind speed) is June (4.8mph).

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Average humidity in September
Seward, AK

Average humidity in September - Seward, AK
  • Average humidity in September: 82%

The months with the highest relative humidity are March, April and December (87%).
The month with the lowest relative humidity is June (80%).

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Average rainfall in September
Seward, AK

Average rainfall in September - Seward, AK
  • Average rainfall in September: 5.75"

The wettest month (with the highest rainfall) is December (7.64").
The driest month (with the least rainfall) is June (2.09").

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Average rainfall days in September
Seward, AK

Average rainfall days in September - Seward, AK
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is August (19 days).
The month with the least rainy days is February (7.6 days).

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Average snowfall in September
Seward, AK

Average snowfall in September - Seward, AK
  • Average snowfall in September: 0"

The month with the highest snowfall is February (18.35").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Seward, AK

Average snowfall days in September - Seward, AK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is March (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Seward, AK

Average sea temperature in September - Seward, AK
  • Average sea temperature in September: 53.4°F

The best month for swimming (with the highest average sea temperature) is August (56°F).
The coldest month (with the lowest average sea temperature) is March (39°F).

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Average daylight in September /
Average sunshine in September
Seward, AK

Average daylight in September / Average sunshine in September - Seward, AK
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).

  • Average sunshine in September: 6h and 1min

The month with the most sunshine is June (Average sunshine: 9h and 30min).
The months with the least sunshine are January and December (Average sunshine: 3h and 6min).

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Average sunshine days in September
Seward, AK

Average sunshine days in September - Seward, AK
  • Average sunshine days in September: 10.6 days

The month with the most sunshine days is January (13.8 days).
The month with the least sunshine days is September (10.6 days).

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Average UV index in September
Seward, AK

Average UV index in September - Seward, AK
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, October, November and December (UV index 1).

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Average cloud cover in September
Seward, AK

Average cloud cover in September - Seward, AK
  • Average cloud cover in September: 53

The month with the most cloud cover is December (Cloud cover 55).
The months with the least cloud cover are March and November (Cloud cover 50).

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Average visibility in September
Seward, AK

Average visibility in September - Seward, AK
  • Average visibility in September: 6mi

The months with the highest visibility are June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May and December (5mi).

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Seward, Alaska, USA

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